here’s the easiest way to know if you have line of sight. stand at your desired mounting location and perform a nazi style salute. don't offend your neighbors. that is at about a 45 degree angle. if you can see a clear sky above your fingers you’ll have line of sight. please keep in mind that this refers to the elevation, not the tilt. the tilt refers to the skew of the dish to make it possible for a multi sat dish to see multi sats as they are arranged in the sky.